Like will a speed ball still appear as a speed ball in B/W because when I traded my Pokemon with a speed ball in diamond, it appeared as a regular pokeball not a speed ball
They do not appear in the inventory, but they appear if you caught a Pokemon with it in HeartGold and SoulSilver and tansferred it. And the Fast Ball turned into a Poke Ball because Diamond and Pearl do not have data for those Poke Balls.
no he does not appear Pokemon b/w but you can get them with cheats